estimate the hamas called cedar hills. is it still here? >> actually to read in the early 1970's frederick douglass site opened and the flagship side of the national park service has over 40 or 50,000 visitors every year. its high of on the hill and the u.s. capitol dome for the right it is really an amazing majestic view and it's open seven days a week, and the curator of the douglas contributed forward and this was important to me, too to make this book not just kind of -- to make active living histories of people that read the book if they've never been to the douglass house would say i want to go over there or if they haven't been there for a few years they can go back over and kind of revisit. >> he is the curator of the douglass house. >> he was the curator for many, many years. a very well-respected kind of a douglass community, and then dr. clifford who was the university archivist at the house contributed the foreword. john muller is the author of frederick douglass and washington, d.c. the line of anacostia. thank you very hatch.